Digital control loop to improve phase noise performance and...

Details Digital control loop to improve phase noise performance and... Digital control loop to improve phase noise performance and...

2006-03-14

2006-03-14

Nguyen, Linh My (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S014000

Reexamination Certificate

active

07012472

ABSTRACT:
A system or method for controlling a voltage controlled oscillator (VCO) or LO buffer includes an amplitude detector for detecting an amplitude value at a node corresponding to the at least one output line. A comparator compares the detected amplitude value with a predetermined amplitude value, and outputs a first digital value when the detected amplitude value is greater than the predetermined amplitude value, and a second digital value when the detected amplitude value is less than the predetermined amplitude value. An accumulator accumulates outputs of the comparator so as to provide an accumulated digital amplitude value. A digital-to-analog converter converts the accumulated digital amplitude value to an accumulated analog amplitude value. The analog accumulated amplitude value is provided as an updated bias control signal to the bias transistor of the VCO or LO buffer.

REFERENCES:
patent: 5038120 (1991-08-01), Wheatley et al.
patent: 6344778 (2002-02-01), Nakamura et al.

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